Alternatively, the patch [http://www.linuxbios.org/pipermail/linuxbios/attachments/20071105/923a1f3f/attachment.bat attached] to this [http://www.coreboot.org/pipermail/linuxbios/2007-November/026759.html message] can be used.

+

Alternatively, the patch [http://www.linuxbios.org/pipermail/linuxbios/attachments/20071105/923a1f3f/attachment.bat attached] to this [http://www.coreboot.org/pipermail/linuxbios/2007-November/026759.html message] can be used. An updated patch that applies cleanly to Revision 3066 can be downloaded [http://www.coreboot.org/images/0/0e/Coreboot_ADLO_FreeBSD-r3066.tgz here].

= Building ADLO =

= Building ADLO =

Revision as of 20:07, 24 September 2010

This article describes how to build coreboot v2 on FreeBSD and boot FreeBSD using coreboot and ADLO inside QEMU.

Requirements

All steps outlined in this article have been performed using FreeBSD 7.0-BETA1/i386. Other versions or architectures of FreeBSD might work, too, but have not been tested. The patches mentioned in this article have been created against coreboot v2, revision 2897.

In order to build ADLO on FreeBSD, you need the following ports installed:

lang/python. At the time of writing this article, that port installs Python 2.4. Possibly other versions of Python also work but haven't been tried.

To boot FreeBSD in QEMU you need

emulators/qemu with modifications. Please refer to the QEMU Build Tutorial for details. Please note that QEMU versions later than 0.9.0 do not seem to work correctly (require the vgabios-cirrus.bin even when started with -nographic and output does not work after ADLO is started).

Obtaining coreboot

See this page on how to download coreboot. I recommend you checkout the latest version of coreboot v2 using Subversion.

Applying the required patches

The coreboot build process currently assumes that the make utility is GNU make. This isn't true on FreeBSD (or the other BSDs for that matter), where GNU make is installed as gmake.

A patch which addresses this can be found here. To download and apply this patch, run the following commands from the top-level directory of your coreboot source tree (e.g. /home/phs/LinuxBIOSv2):

Alternatively, the patch attached to this message can be used. An updated patch that applies cleanly to Revision 3066 can be downloaded here.

Building ADLO

In order to boot FreeBSD using coreboot, ADLO is used as a payload. Therefore, it must be built before the coreboot image can be built. Building ADLO on FreeBSD requires that the 8086 development environment is installed. See the following section for details.

ADLO is part of the coreboot v2 source tree. Assuming you have applied the required patches, it can be built by issuing the following commands from the top-level directory of your local source tree:

$ cd util/ADLO
$ gmake

You will now find the ADLO payload at util/ADLO/payload.

Building the 8086 development environment

ADLO requires the devel/dev86 port which installs the 8086 development environment. This is a new port not yet included in the FreeBSD Ports tree, see Problem Report ports/117480. To build the port, download and extract the shell archive attached to the problem report.

This should give you a file called qemu-bios.rom in targets/emulation/qemu-i386/qemu-i386. Copy this file to a convenient location, e.g. your home directory, and rename it to bios.bin.

$ cp qemu-bios.rom ~/bios.bin

You will need it later.

Booting FreeBSD inside QEMU

If you already have a FreeBSD installation inside QEMU, you can boot it using coreboot with the following command:

$ qemu -kernel-kqemu -hda freebsd.img -nographic -L ~

This assumes, that there is a file called bios.bin in your home directory that contains coreboot with an ADLO payload. The file freebsd.img should contain your FreeBSD installation. Make sure it uses the serial console, though, as graphical output will not work when booted using coreboot.

Installing FreeBSD inside QEMU

Installing FreeBSD inside QEMU is pretty straight forward. If you already have a working installation, you can skip this section.

First you need to create a QEMU disk:

$ qemu-img create freebsd.img 1024M

This will create a QEMU virtual disk named freebsd.img with a capacity of 1 GByte. Next, install the base system using one of the ISO files provided by the FreeBSD Project at ftp://ftp.freebsd.org/pub/FreeBSD/ISO-IMAGES-i386 and have QEMU use it as the boot device. In this example, the FreeBSD 7.0-BETA1 bootonly disc [1] is used:

Inside QEMU, perform an installation as you normally would. See the FreeBSD Handbook for details. After the installation has finished, boot up FreeBSD once without using coreboot.

$ qemu -kernel-kqemu -hda freebsd.img

In the FreeBSD installation running inside QEMU add the following to the file /boot/loader.conf:

console=comconsole

This will cause FreeBSD to use the first serial port as a console. Both the Loader's and the Kernel's messages will end up there. This is important as graphical output won't work once FreeBSD is booted using coreboot and ADLO.

This file is licensed under the Creative CommonsAttribution ShareAlike 3.0 License.In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one.